実録 Let's build a simple Rack compatible server

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࣮࿥ -FU`TCVJMEBTJNQMF 3BDLDPNQBUJCMFTFSWFS⚡⚡⚡ ԘҪඒ࡙!DPF@ 'FC େߐށ3VCZձٞ

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ࣗݾ঺հ ԘҪඒ࡙ ͓͍͠ !DPF@ 8FCϓϩάϥϚ "TBLVTBSCɺ5BNBSCɺ'VLVPLBSCʢ࿦ཧʣʹ͍·͢ "TBLVTBSCʹ௨͍࢝ΊͯૣҰ೥൒ ࠷ۙ8FCαʔόʔΛ࡞Γ·ͨ͠

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ࣗݾ঺հ ԘҪඒ࡙ ͓͍͠ !DPF@ 8FCϓϩάϥϚ "TBLVTBSCɺ5BNBSCɺ'VLVPLBSCʢ࿦ཧʣʹ͍·͢ "TBLVTBSCʹ௨͍࢝ΊͯૣҰ೥൒ ࠷ۙ8FCαʔόʔΛ࡞Γ·ͨ͠ ‐ࠓ೔ͷ͓࿩

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3VCZ$POG/BTIWJMMF /PWFNCFS

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ग़యɿIUUQTOPUJTUFTUIFSD(V(+MFUTCVJMEBTJNQMFIUUQTFSWFSXJUISVCZ ʮ-FU`TCVJMEBTJNQMF)551TFSWFSʯ &45)&30-"56/%&͞Μ!FTUIFS ‎

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‎JHBJHB͞Μ!JHBJHB‎ ग़యɿIUUQTUXJUUFSDPNJHBJHBTUBUVT T

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‎͏ͮΒ͞Μ!VE[VSB 'VLVPLBSC ‎ ‎Θͨ͠ !DPF@ ग़యɿIUUQTUXJUUFSDPNVE[VSBTUBUVT T !DPF@

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ͱ͍͏͜ͱͰɺ ൃදࢿྉΛࢀߟʹ γϯϓϧͳ)551αʔόʔΛ ࡞ͬͯΈ·ͨ͠

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ग़དྷ্͕ͬͨͷ͕ͪ͜Β 1 require ‘socket’ 2 3 server = TCPServer.new(‘localhost’, 5000) 4 5 loop do 6 client = server.accept 7 request = client.readpartial(2048) 8 9 puts request 10 11 client.puts response <<~MESSAGE 12 HTTP/1.1 200 OK\r\n 13 Content-Type: text/plain\r\n 14 \r\n 15 Hello!\r\n 16 MESSAGE 17 end TPDLFUϥΠϒϥϦΛSFRVJSF

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1 require ‘socket’ 2 3 server = TCPServer.new(‘localhost’, 5000) 4 5 loop do 6 client = server.accept 7 request = client.readpartial(2048) 8 9 puts request 10 11 client.puts response <<~MESSAGE 12 HTTP/1.1 200 OK\r\n 13 Content-Type: text/plain\r\n 14 \r\n 15 Hello!\r\n 16 MESSAGE 17 end αʔόʔ઀ଓΛPQFO ΫϥΠΞϯτ͔Βͷ઀ଓཁٻΛड͚෇͚Δ ϦΫΤετϝοηʔδΛಡΈࠐΉ ϦΫΤετϝοηʔδΛαʔόʔଆʹग़ྗ ద౰ͳϨεϙϯεϝοηʔδ ϨεϙϯεϝοηʔδΛΫϥΠΞϯτଆʹग़ྗ ग़དྷ্͕ͬͨͷ͕ͪ͜Β

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DVSMMPDBMIPTU ࡞ͬͨαʔόʔͷϗετͱϙʔτ൪߸

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ಈ͖·ͨ͠ αʔόʔଆ ΫϥΠΞϯτଆ ϦΫΤετϝοηʔδ͕ ग़ྗ͞Ε͍ͯΔ ϨεϙϯεϘσΟ͕ ग़ྗ͞Ε͍ͯΔ

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͔͠͠

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ಈతͳΞϓϦέʔγϣϯʹ͸ରԠ͍ͯ͠ͳ͍⚠ 1 require ‘socket’ 2 3 server = TCPServer.new(‘localhost’, 5000) 4 5 loop do 6 client = server.accept 7 request = client.readpartial(2048) 8 9 puts request 10 11 client.puts response <<~MESSAGE 12 HTTP/1.1 200 OK\r\n 13 Content-Type: text/plain\r\n 14 \r\n 15 Hello!\r\n 16 MESSAGE 17 end ͦ΋ͦ΋ ΞϓϦέʔγϣϯ͕ ଘࡏ͠ͳ͍ ΞΫηε͢Δͨͼɺຖճ ಉ͡Ϩεϙϯεϝοηʔδ͕ ग़ྗ͞ΕΔ

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͔ͤͬ͘ͳͷͰ 3BDLDPNQBUJCMFʹ͍ͨ͠

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γϯϓϧͰ3BDLDPNQBUJCMFͳ 4JNQMF3BDL$PNQBUJCMF4FSWFS ͱ͍͏໊લͷαʔόʔΛ ࡞ͬͯΈ͍ͨͱࢥ͍·͢

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1 require ‘rack’ 2 require_relative ‘../server/simple_rack_compatible_server’ 3 4 class App 5 def call(env) 6 [ 7 200, 8 { ‘Content-Type’ => ‘text/html’ }, 9 [“

Hello.

This app is running on .…

”] 10 ] 11 end 12 end 13 14 run App.new ݕূ༻ͷ3BDLΞϓϦέʔγϣϯ͕ͪ͜Β app/sample.ru

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1 require ‘rack’ 2 require_relative ‘../server/simple_rack_compatible_server’ 3 4 class App 5 def call(env) 6 [ 7 200, 8 { ‘Content-Type’ => ‘text/html’ }, 9 [“

Hello.

This app is running on .…

”] 10 ] 11 end 12 end 13 14 run App.new εςʔλε‎)5510, ϔομ‎$POUFOU5ZQFUFYUIUNM ϘσΟ‎EJW I)FMMPI Q5IJTBQQJTʜQ EJW ݕূ༻ͷ3BDLΞϓϦέʔγϣϯ͕ͪ͜Β app/sample.ru ࣮ߦ͢Δͱʜ

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3BDLΞϓϦέʔγϣϯ͕ىಈ͢ΔྲྀΕ SBDLVQίϚϯυΛ࣮ߦ ϋϯυϥʔΛىಈ ϋϯυϥʔʹαʔόʔΛొ࿥ αʔόʔຊମ͕ॲཧΛ։࢝ αʔόʔΛىಈ 3BDLຊମͱ αʔόʔຊମΛ઀ଓ αʔόʔ͕ ΞϓϦέʔγϣϯΛ࣮ߦ ىಈ։࢝ 3BDLΞϓϦέʔγϣϯΛ࣮ߦ

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3BDLΞϓϦέʔγϣϯ͕ىಈ͢ΔྲྀΕ SBDLVQίϚϯυΛ࣮ߦ ϋϯυϥʔΛىಈ ϋϯυϥʔʹαʔόʔΛొ࿥ αʔόʔຊମ͕ॲཧΛ։࢝ αʔόʔΛىಈ 3BDLΞϓϦέʔγϣϯΛ࣮ߦ 3BDLຊମͷ )BOEMFSϞδϡʔϧΛ࢖ͬͨ αʔόʔຊମͷॲཧ αʔόʔຊମͷॲཧ 3BDLຊମͷॲཧ

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3BDLDPNQBUJCMFͳαʔόʔͷػೳཁ݅ 3BDLΞϓϦέʔγϣϯ͕ىಈ͢ΔྲྀΕΛ౿·͑ͯɺ αʔόʔʹඞཁͳػೳΛߟ͑Δ ᶃϋϯυϥʔ 3BDL)BOEMFS4JNQMF3BDL$PNQBUJCMF4FSWFS ⚡3BDLຊମͷ)BOEMFSϞδϡʔϧʹαʔόʔΛొ࿥͢Δ ⚡αʔόʔΛىಈ͢Δ ᶄαʔόʔຊମ 4JNQMF3BDL$PNQBUJCMF4FSWFS4FSWFS ⚡ϦΫΤετΛड͚Δ ⚡ΞϓϦέʔγϣϯΛ࣮ߦ͢Δ ⚡ϨεϙϯεΛฦ͢

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1 require ‘rack/handler’ 2 3 module Rack 4 module Handler 5 class SimpleRackCompatibleServer 6 def self.run(app, options = {}) 7 environment = ENV[‘RACK_ENV’] || ‘development’ 8 default_host = environment == ‘development’ ? ‘localhost’ : ‘0.0.0.0’ 9 10 host = options.delete(:Host) || default_host 11 port = options.delete(:Port) || 9292 12 args = [host, port, app] 13 ::SimpleRackCompatibleServer::Server.new(*args).start 14 end 15 end 16 17 register :simple_rack_compatible_server, SimpleRackCompatibleServer 18 end 19 end ࢀߟɿIUUQTHJUIVCDPNNBDPVSOPZFSUIJO rack/handler/simple_rack_compatible_server.rb ϋϯυϥʔΛ࣮૷ ࢀߟ5IJO 3BDL)BOEMFSϞδϡʔϧΛSFRVJSF

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1 require ‘rack/handler’ 2 3 module Rack 4 module Handler 5 class SimpleRackCompatibleServer 6 def self.run(app, options = {}) 7 environment = ENV[‘RACK_ENV’] || ‘development’ 8 default_host = environment == ‘development’ ? ‘localhost’ : ‘0.0.0.0’ 9 10 host = options.delete(:Host) || default_host 11 port = options.delete(:Port) || 9292 12 args = [host, port, app] 13 ::SimpleRackCompatibleServer::Server.new(*args).start 14 end 15 end 16 17 register :simple_rack_compatible_server, SimpleRackCompatibleServer 18 end 19 end rack/handler/simple_rack_compatible_server.rb 3BDL)BOEMFSϞδϡʔϧʹαʔόʔΛొ࿥͢Δ ࢀߟɿIUUQTHJUIVCDPNNBDPVSOPZFSUIJO ϋϯυϥʔΛ࣮૷ ࢀߟ5IJO

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1 require ‘rack/handler’ 2 3 module Rack 4 module Handler 5 class SimpleRackCompatibleServer 6 def self.run(app, options = {}) 7 environment = ENV[‘RACK_ENV’] || ‘development’ 8 default_host = environment == ‘development’ ? ‘localhost’ : ‘0.0.0.0’ 9 10 host = options.delete(:Host) || default_host 11 port = options.delete(:Port) || 9292 12 args = [host, port, app] 13 ::SimpleRackCompatibleServer::Server.new(*args).start 14 end 15 end 16 17 register :simple_rack_compatible_server, SimpleRackCompatibleServer 18 end 19 end rack/handler/simple_rack_compatible_server.rb ࢀߟɿIUUQTHJUIVCDPNNBDPVSOPZFSUIJO αʔόʔΛىಈ͢Δϝιου ϋϯυϥʔΛ࣮૷ ࢀߟ5IJO

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1 require ‘rack/handler’ 2 3 module Rack 4 module Handler 5 class SimpleRackCompatibleServer 6 def self.run(app, options = {}) 7 environment = ENV[‘RACK_ENV’] || ‘development’ 8 default_host = environment == ‘development’ ? ‘localhost’ : ‘0.0.0.0’ 9 10 host = options.delete(:Host) || default_host 11 port = options.delete(:Port) || 9292 12 13 14 end 15 end 16 17 18 end 19 end rack/handler/simple_rack_compatible_server.rb ࣮ߦ؀ڥ͔Βϗετͱϙʔτ൪߸Λઃఆ͢Δ ˞σϑΥϧτͰMPDBMIPTUʹ઀ଓ ࢀߟɿIUUQTHJUIVCDPNNBDPVSOPZFSUIJO ϋϯυϥʔΛ࣮૷ ࢀߟ5IJO

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1 require ‘rack/handler’ 2 3 module Rack 4 module Handler 5 class SimpleRackCompatibleServer 6 def self.run(app, options = {}) 7 environment = ENV[‘RACK_ENV’] || ‘development’ 8 default_host = environment == ‘development’ ? ‘localhost’ : ‘0.0.0.0’ 9 10 host = options.delete(:Host) || default_host 11 port = options.delete(:Port) || 9292 12 args = [host, port, app] 13 14 end 15 end 16 17 18 end 19 end rack/handler/simple_rack_compatible_server.rb αʔόʔʹ౉͢Ҿ਺Λ༻ҙ͢Δ ⚡ϗετ ⚡ϙʔτ൪߸ ⚡3BDLΞϓϦέʔγϣϯຊମ ࢀߟɿIUUQTHJUIVCDPNNBDPVSOPZFSUIJO ϋϯυϥʔΛ࣮૷ ࢀߟ5IJO

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1 require ‘rack/handler’ 2 3 module Rack 4 module Handler 5 class SimpleRackCompatibleServer 6 def self.run(app, options = {}) 7 environment = ENV[‘RACK_ENV’] || ‘development’ 8 default_host = environment == ‘development’ ? ‘localhost’ : ‘0.0.0.0’ 9 10 host = options.delete(:Host) || default_host 11 port = options.delete(:Port) || 9292 12 args = [host, port, app] 13 ::SimpleRackCompatibleServer::Server.new(*args).start 14 end 15 end 16 17 18 end 19 end rack/handler/simple_rack_compatible_server.rb αʔόʔ 4JNQMF3BDL$PNQBUJCMF4FSWFS4FSWFS Λ ΠϯελϯεԽ͠ OFX ɺىಈ͢Δ TUBSU ࢀߟɿIUUQTHJUIVCDPNNBDPVSOPZFSUIJO ϋϯυϥʔΛ࣮૷ ࢀߟ5IJO

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1 require ‘socket’ 2 3 module SimpleRackCompatibleServer 4 class Server 5 def initialize(*args) 6 @host, @port, @app = args 7 end 8 9 def start 26 end 27 end 28 end simple_rack_compatible_server.rb αʔόʔΛ࣮૷શମ૾ ʜ ϋϯυϥʔ͔ΒҾ͖ܧ͍ͩ ⚡ϗετ ⚡ϙʔτ൪߸ ⚡3BDLΞϓϦέʔγϣϯຊମ ͰΠϯελϯεΛॳظԽ͢Δ ݩʑͷ)551αʔόʔͷॲཧʹ ͭͷมߋ఺Λ௥Ճ ৄ͘͠͸࣍ͷεϥΠυ

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9 def start 10 server = TCPServer.new(@host, @port) 11 12 loop do 13 client = server.accept 14 request = client.readpartial(2048) 15 16 @status, @header, @body = @app.call 17 18 puts request 19 20 client.puts <<~MESSAGE 21 #{‘HTTP/1.1 200 OK’ if @status.eql? 200}\r\n 22 #{@header.map { |k, v| [k, v].join(’: ’) }.join(“\r\n”)}\r\n 23 \r\n 24 #{@body} 25 MESSAGE 26 end simple_rack_compatible_server.rb มߋ఺ᶄ 3BDLΞϓϦέʔγϣϯ࣮ߦ ฦΓ஋Λऔಘ͢Δ มߋ఺ᶅ ฦΓ஋͔ΒϨεϙϯεϝοηʔδΛੜ੒ αʔόʔΛ࣮૷TUBSUϝιου มߋ఺ᶃ ϋϯυϥʔ͔Β౉ͨ͠ ϗετͱϙʔτ൪߸Λઃఆ

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͔͠͠

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9 def start 10 server = TCPServer.new(@host, @port) 11 12 loop do 13 client = server.accept 14 request = client.readpartial(2048) 15 16 @status, @header, @body = @app.call(???) 17 18 puts request 19 20 client.puts <<~MESSAGE 21 #{‘HTTP/1.1 200 OK’ if @status.eql? 200}\r\n 22 #{@header.map { |k, v| [k, v].join(’: ’) }.join(“\r\n”)}\r\n 23 \r\n 24 #{@body} 25 MESSAGE 26 end simple_rack_compatible_server.rb Ͳ͏͠Α͏ʜ DBMMϝιουʹ౉͢Ҿ਺͕Θ͔Βͳ͍⚠ ؀ڥม਺ΛϋογϡͷܗͰ ೖΕΔඞཁ͕͋Δ

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9 def start 10 server = TCPServer.new(@host, @port) 11 12 loop do 13 client = server.accept 14 request = client.readpartial(2048) 15 16 @status, @header, @body = @app.call({ }) 17 18 puts request 19 20 client.puts <<~MESSAGE 21 #{‘HTTP/1.1 200 OK’ if @status.eql? 200}\r\n 22 #{@header.map { |k, v| [k, v].join(’: ’) }.join(“\r\n”)}\r\n 23 \r\n 24 #{@body} 25 MESSAGE 26 end simple_rack_compatible_server.rb Θ͔Βͳ͍ͷͰ ۭϋογϡΛ ೖΕͯΈ·ͨ͠

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SBDLVQTTJNQMF@SBDL@DPNQBUJCMF@TFSWFS ͱΓ͋͑ͣ

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‎ͩΊͰͨ͠ ר͖ى͜ΔΤϥʔ☠☠☠

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ೖྗඞਢͷ؀ڥม਺͕͋ΔΒ͍͠ FOWNJTTJOHSFRVJSFELFZ3&26&45@.&5)0% 3BDL-JOU-JOU&SSPS

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rack/lib/rack/lint.rb 3BDL-JOUΫϥεΛ֬ೝ

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rack/lib/rack/lint.rb 3BDL-JOUΫϥεΛ֬ೝ ඞཁͳ؀ڥม਺ʹ͍ͭͯղઆͯ͘͠Ε͍ͯΔʂ ʜ

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⚡1"5)@*/'0‎ϦΫΤετ63-ͷύε ⚡26&3:@453*/(‎ΫΤϦจࣈྻ ⚡.&5)0%‎)551ϝιου ⚡4&37&3@/".&‎4$3*15@/".&ͱ1"5)@*/'0ͱͷ ૊Έ߹ΘͤͰ63-Λߏங͢Δ ⚡4&37&3@1035‎4$3*15@/".&ͱ1"5)@*/'0ͱͷ ૊Έ߹ΘͤͰ63-Λߏங͢Δ 1&1Ͱఆٛ͞Εͨ؀ڥม਺ 1&1‎1ZUIPO8FC4FSWFS(BUFXBZ*OUFSGBDFW IUUQTXXXQZUIPOPSHEFWQFQTQFQ

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⚡SBDLWFSTJPO‎3BDLͷόʔδϣϯ ഑ྻ ⚡SBDLJOQVU‎ೖྗετϦʔϜ *0ϥΠΫͳΦϒδΣΫτ ⚡SBDLFSSPST‎ΤϥʔετϦʔϜ QVUTXSJUFqVTIΛݺ΂ΔΦϒδΣΫτ ⚡SBDLNVMUJQSPDFTT‎ΞϓϦέʔγϣϯ͕ෳ਺ͷϓϩηεʹΑͬͯ ಉ࣌ʹݺͼग़͞ΕΔ͔Ͳ͏͔ ⚡SBDLNVMUJUISFBE‎ΞϓϦέʔγϣϯ͕ ಉ͡ϓϩηε಺ͷෳ਺ͷεϨουʹΑͬͯ ಉ࣌ʹݺͼग़͞ΕΔ͔Ͳ͏͔ ⚡SBDLSVO@PODF‎ΞϓϦέʔγϣϯ͕ͦͷϓϩηεͷ࣮ߦதʹ Ұ౓͚ͩݺͼग़͞ΕΔ͔Ͳ͏͔ $(*ϕʔεͷαʔόʔͰͷΈUSVFʹͳΔ ⚡SBDLVSM@TDIFNF‎63*εΩʔϜ IUUQPSIUUQT 3BDL؀ڥݻ༗ͷ؀ڥม਺

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18 def env 19 { 20 ‘PATH_INFO’ => @path || ‘/’, 21 ‘QUERY_STRING’ => @query || ‘’, 22 ‘METHOD’ => @method || ‘GET’, 23 ‘SERVER_NAME’ => ‘simple_rack_compatible_server’, 24 ‘SERVER_PORT’ => @port.to_s, 25 ‘rack.version’ => Rack::VERSION, 26 ‘rack.input’ => StringIO.new(@input || ‘’).set_encoding(‘ASCII_8BIT’), 27 ‘rack.errors’ => $stderr, 28 ‘rack.multiprocess’ => false, 29 ‘rack.multithread’ => false, 30 ‘rack.run_once’ => false, 31 ‘rack.url_scheme’ => @scheme&.downcase&.slice(/http[a-z]*/) || ‘http’ 32 } 33 end simple_rack_compatible_server.rb 3BDL-JOUΛࢀߟʹ؀ڥม਺Λઃఆ ϦΫΤετ͔Βಈతʹੜ੒ͨ͠؀ڥม਺ PSσϑΥϧτ஋

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35 def start 36 server = TCPServer.new(@host, @port) 37 38 loop do 39 client = server.accept 40 41 request = client.readpartial(2048).split(“\r\n”) 42 @method, path, @scheme = request.ﬁrst.split 43 @path, @query = path.split(‘?’) 44 @input = request.index(‘’) ? request[request.index(‘’) + 1] : ‘’ 45 46 puts “Received request message: #{@method} #{@path} #{@scheme}” 47 48 @status, @header, @body = @app.call(env) 49 50 client.puts <<~MESSAGE 51 # … simple_rack_compatible_server.rb ϦΫΤετϝοηʔδ͔Β؀ڥม਺Λੜ੒ ؀ڥม਺Λੜ੒͢ΔίʔυΛ௥Ճ

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35 def start 36 server = TCPServer.new(@host, @port) 37 38 loop do 39 client = server.accept 40 41 request = client.readpartial(2048).split(“\r\n”) 42 @method, path, @scheme = request.ﬁrst.split 43 @path, @query = path.split(‘?’) 44 45 46 47 48 49 50 51 simple_rack_compatible_server.rb !QBUI‎ϦΫΤετ63-ͷύε !RVFSZ‎ΫΤϦจࣈྻ ϦΫΤετϝοηʔδ͔Β؀ڥม਺Λੜ੒

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35 def start 36 server = TCPServer.new(@host, @port) 37 38 loop do 39 client = server.accept 40 41 request = client.readpartial(2048).split(“\r\n”) 42 @method, path, @scheme = request.ﬁrst.split 43 @path, @query = path.split(‘?’) 44 @input = request.index(‘’) ? request[request.index(‘’) + 1] : ‘’ 45 46 47 48 49 50 51 simple_rack_compatible_server.rb !JOQVU‎ೖྗετϦʔϜ ϦΫΤετϘσΟ ϦΫΤετϝοηʔδ͔Β؀ڥม਺Λੜ੒

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35 def start 36 server = TCPServer.new(@host, @port) 37 38 loop do 39 client = server.accept 40 41 request = client.readpartial(2048).split(“\r\n”) 42 @method, path, @scheme = request.ﬁrst.split 43 @path, @query = path.split(‘?’) 44 @input = request.index(‘’) ? request[request.index(‘’) + 1] : ‘’ 45 46 puts “Received request message: #{@method} #{@path} #{@scheme}” 47 48 49 50 51 simple_rack_compatible_server.rb ͔ͤͬ͘ͳͷͰϩά ΋ग़ྗ ϦΫΤετϝοηʔδ͔Β؀ڥม਺Λੜ੒

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SBDLVQTTJNQMF@SBDL@DPNQBUJCMF@TFSWFS ͋ΒͨΊͯ

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‎ಈ͖·ͨ͠ 3FDFJWFESFRVFTUNFTTBHF(&5)551 3BDL-JOU-JOU&SSPSΤϥʔ͕ফ͑ͯ ϩά͕ग़ྗ͞Ε͍ͯΔʂ λʔϛφϧʹͯ

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ϒϥ΢βͷݕূπʔϧʹͯ 3BDLΞϓϦέʔγϣϯ͔Βऔಘͨ͠ εςʔλείʔυͱϔομΛ ΫϥΠΞϯτଆʹ౉͢͜ͱ͕Ͱ͖͍ͯΔʂ ϔομ $POUFOU5ZQFUFYUIUNM εςʔλείʔυ

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ϨεϙϯεϘσΟ͸ʜ

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ϨεϙϯεϘσΟ͸ʜ

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Կ͔͕͓͔͍͠ ཧ૝ ݱ࣮ SBDLCPEZQSPYZ ϨεϙϯεϘσΟΛಡΈࠐΜͰ %0.͕ੜ੒͞ΕΔ

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35 def start 36 server = TCPServer.new(@host, @port) 37 38 loop do … 47 48 @status, @header, @body = @app.call(env) 49 50 client.puts <<~MESSAGE 51 #{‘HTTP/1.1 200 OK’ if @status.eql? 200}\r\n 52 #{@header.map { |k, v| [k, v].join(’: ’) }.join(“\r\n”)}\r\n 53 \r\n 54 #{@body} 55 MESSAGE 56 end 57 end simple_rack_compatible_server.rb Ϩεϙϯεϝοηʔδ͸Ͳ͏ͳ͍ͬͯΔʁ ཧ૝ͷϨεϙϯεϘσΟ͸ [“

Hello.

This app is …

”] 3BDLΞϓϦέʔγϣϯΛ࣮ߦͯ͠ฦΓ஋Λऔಘ ‎<εςʔλείʔυ \ϔομ^ <ϘσΟ>>

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!CPEZͷத਎͸Ͳ͏ͳ͍ͬͯΔʁ JSC 4JNQMF3BDL$PNQBUJCMF4FSWFS4FSWFSYʜ QQ!CPEZ 3BDL#PEZ1SPYZYʜ !CMPDL 1SPDYʜ!ʜSBDLMJCSBDLDPNNPO@MPHHFSSC !CPEZ 3BDL-JOUYʜ !BQQ 3BDL5FNQpMF3FBQFSYʜ!BQQ"QQYʜ !CPEZ 3BDL#PEZ1SPYZYʜ !CMPDL 1SPDYʜ!ʜSBDLMJCSBDLUFNQpMF@SFBQFSSC !CPEZ !DMPTFEGBMTF

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JSC 4JNQMF3BDL$PNQBUJCMF4FSWFS4FSWFSYʜ QQ!CPEZ 3BDL#PEZ1SPYZYʜ !CMPDL 1SPDYʜ!ʜSBDLMJCSBDLDPNNPO@MPHHFSSC !CPEZ 3BDL-JOUYʜ !BQQ 3BDL5FNQpMF3FBQFSYʜ!BQQ"QQYʜ !CPEZ 3BDL#PEZ1SPYZYʜ !CMPDL 1SPDYʜ!ʜSBDLMJCSBDLUFNQpMF@SFBQFSSC !CPEZ !DMPTFEGBMTF ͋Δ औΓग़͠ํ͕Θ͔Βͳ͍ʜ !CPEZͷத਎͸Ͳ͏ͳ͍ͬͯΔʁ

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!CPEZΛDBMMͯ͠Έ·ͨ͠ JSC 4JNQMF3BDL$PNQBUJCMF4FSWFSTFSWʜ QQ!CPEZDBMM FOW < \$POUFOU5ZQFUFYUIUNM^ 3BDL-JOUYʜ !BQQ 3BDL5FNQpMF3FBQFSYʜ!BQQ"QQYʜ !CPEZ 3BDL#PEZ1SPYZYʜ !CMPDL 1SPDYʜ!ʜSBDLMJCSBDLUFNQpMF@SFBQFSSC !CPEZ <EJWI)FMMPIQ5IJTBQQJTʜQEJW> !DMPTFEGBMTF !DPOUFOU@MFOHUIOJM !IFBE@SFRVFTUGBMTF>

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!CPEZΛDBMMͯ͠Έ·ͨ͠ JSC 4JNQMF3BDL$PNQBUJCMF4FSWFSTFSWFʜ QQ!CPEZDBMM FOW < \$POUFOU5ZQFUFYUIUNM^ 3BDL-JOUYʜ !BQQ 3BDL5FNQpMF3FBQFSYʜ!BQQ"QQYʜ !CPEZ 3BDL#PEZ1SPYZYʜ !CMPDL 1SPDYʜ!ʜSBDLMJCSBDLUFNQpMF@SFBQFSSC !CPEZ !DMPTFEGBMTF !DPOUFOU@MFOHUIOJM !IFBE@SFRVFTUGBMTF> ԕ͍ʜ ϨεϙϯεϘσΟͦͷ΋ͷ͕ औಘͰ͖ΔΑ͏ʹͳΔ·Ͱ ԆʑDBMM͠ଓ͚Δ͔͠ͳ͍ʜʁʁ ϘσΟ 3BDL-JOUͷΠϯελϯε

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ߴڮ͞Μ͔Βͷώϯτ DBMMϝιουͷฦ͢ཁૉ഑ྻͷͭ໨͸CPEZͰɺ CPEZ͸FBDIϝιουͱ͔UP@QBUIϝιουͱ͔Λୟ͚Δ ΦϒδΣΫτͰ͔͠ͳ͘

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ʜFBDIϝιουʁ ߴڮ͞Μ͔Βͷώϯτ DBMMϝιουͷฦ͢ཁૉ഑ྻͷͭ໨͸CPEZͰɺ CPEZ͸FBDIϝιουͱ͔UP@QBUIϝιουͱ͔Λୟ͚Δ ΦϒδΣΫτͰ͔͠ͳ͘

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3BDL#PCZ1SPYZFBDI 3BDL#PCZ1SPYZ͸FBDIϝιουΛ࣋ͭ ࢖͑ΔͷͰ͸ʁ

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1 require ‘socket’ 2 3 module SimpleRackCompatibleServer 4 class Server 69 def body 70 res_body = [] 71 @body.each { |body| res_body << body } 72 res_body.join(“\n”) 73 end 74 end 75 end simple_rack_compatible_server.rb FBDIΛ࢖ͬͯϨεϙϯεϘσΟΛऔΓग़͢ … !CPEZʹFBDIΛݺͼ഑ྻͱͯ͠୅ೖ͠௚͢ ࠷ޙʹจࣈྻʹ௚͢

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35 def start 48 @status, @header, @body = @app.call(env) 49 50 client.puts <<~MESSAGE 51 #{‘HTTP/1.1 200 OK’ if @status.eql? 200}\r\n 52 #{@header.map { |k, v| [k, v].join(’: ’) }.join(“\r\n”)}\r\n 53 \r\n 54 #{body} 55 MESSAGE 56 end 57 end simple_rack_compatible_server.rb ϨεϙϯεϘσΟΛݺͼग़͢ … CPEZϝιουΛݺͿ

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SBDLVQTTJNQMF@SBDL@DPNQBUJCMF@TFSWFS ͋ΒͨΊͯ

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ಈ͖·ͨ͠ ϨεϙϯεϘσΟ΋දࣔͰ͖·ͨ͠

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εςʔλείʔυɺϔομɺϘσΟͷશͯΛ ΫϥΠΞϯτଆʹग़ྗͰ͖·ͨ͠ʂ ಈ͖·ͨ͠ εςʔλε‎)5510, ϔομ‎$POUFOU5ZQFUFYUIUNM ϘσΟ‎EJW I)FMMPI Q5IJTBQQJTʜQ EJW

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࠷ऴతʹ͜͏ͳΓ·ͨ͠⚡

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1 require ‘socket’ 2 3 module SimpleRackCompatibleServer 4 class Server 5 def initialize(*args) 6 @host, @port, @app = args 7 @method = nil 8 @path = nil 9 @scheme = nil 10 @query = nil 11 @input = nil 12 @status = nil 13 @header = nil 14 @body = nil 15 end simple_rack_compatible_server.rb 4JNQMF3BDL$PNQBUJCMF4FSWFS4FSWFSJOJUJBMJ[F ⚡TPDLFUϥΠϒϥϦΛSFRVJSF ⚡ඞཁͳΠϯελϯεม਺ΛॳظԽ

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18 def env 19 { 20 ‘PATH_INFO’ => @path || ‘/’, 21 ‘QUERY_STRING’ => @query || ‘’, 22 ‘METHOD’ => @method || ‘GET’, 23 ‘SERVER_NAME’ => ‘simple_rack_campatible_server’, 24 ‘SERVER_PORT’ => @port.to_s, 25 ‘rack.version’ => Rack::VERSION, 26 ‘rack.input’ => StringIO.new(@input || ‘’).set_encoding(‘ASCII_8BIT’), 27 ‘rack.errors’ => $stderr, 28 ‘rack.multiprocess’ => false, 29 ‘rack.multithread’ => false, 30 ‘rack.run_once’ => false, 31 ‘rack.url_scheme’ => @scheme&.downcase&.slice(/http[a-z]*/) || ‘http’ 32 } 33 end simple_rack_compatible_server.rb 4JNQMF3BDL$PNQBUJCMF4FSWFS4FSWFSFOW ⚡3BDLΞϓϦέʔγϣϯͷ࣮ߦʹඞཁͳ؀ڥม਺Λ༻ҙ

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35 def start 36 server = TCPServer.new(@host, @port) 37 38 puts <<~MESSAGE 39 #{@app} is running on #{@host}: #{@port} 40 => Use Ctrl-C to stop 41 MESSAGE 42 43 loop do 44 client = server.accept 60 end 61 end simple_rack_compatible_server.rb … 4JNQMF3BDL$PNQBUJCMF4FSWFS4FSWFSTUBSU ⚡ϧʔϓॲཧΛ։࢝͢Δ ⚡ΫϥΠΞϯτ͔Βͷ઀ଓཁٻΛड͚෇͚Δ ⚡αʔόʔ઀ଓΛ։࢝͢Δ ⚡։࢝ϝοηʔδΛग़ྗ͢Δ

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46 begin 47 request = client.readpartial(2048).split(“\r\n”) 48 @method, path, @scheme = request.ﬁrst.split 49 @path, @query = path.split(‘?’) 50 @input = request.index(‘’) ? request[request.index(‘’) + 1] : ‘’ 51 52 puts “Received request message: #{@method} #{@path} #{@schema}” 53 54 55 56 57 58 59 end simple_rack_compatible_server.rb 4JNQMF3BDL$PNQBUJCMF4FSWFS4FSWFSTUBSU ⚡ϦΫΤετϝοηʔδΛಡΈࠐΉ ⚡3BDLΞϓϦέʔγϣϯͷ࣮ߦʹඞཁͳ؀ڥม਺Λੜ੒͢Δ ⚡αʔόʔʹϩάΛग़ྗ͢Δ

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46 begin 47 48 49 50 51 52 53 54 @status, @header, @body = @app.call(env) 55 56 client.puts [status, header, ‘’, body].join(“\r\n”) 57 ensure 58 client.close 59 end simple_rack_compatible_server.rb 4JNQMF3BDL$PNQBUJCMF4FSWFS4FSWFSTUBSU ⚡3BDLΞϓϦέʔγϣϯΛ࣮ߦ͠ɺฦΓ஋Λऔಘ͢Δ ⚡ฦΓ஋͔ΒϨεϙϯεϝοηʔδΛੜ੒͠ɺग़ྗ͢Δ ⚡ιέοτΛด͡Δ

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46 begin 47 48 49 50 51 52 53 54 55 56 client.puts [status, header, ‘’, body].join(“\r\n”) 57 ensure 58 client.close 59 end simple_rack_compatible_server.rb 4JNQMF3BDL$PNQBUJCMF4FSWFS4FSWFSTUBSU 67 def status 68 case @status 69 when 200 70 “#{@schema} 200 OK” 82 def header 83 @header.map { |k, v| [k, v].join(’: ’) }.join(“\r\n”) 84 end 86 def body 87 res_body = [] 88 @body.each { |body| res_body << body } 89 res_body.join(“\n”) 90 end

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͓ർΕ༷Ͱͨ͠✨

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ը૾ɿIUUQTUXJUUFSDPNUFOEFSMPWF ग़యɿIUUQTTQFBLFSEFDLDPNUFOEFSMPWFHBPEVOBLPEP "BSPO͞Μɹɹɹɹ

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ײ૝ 3BDLΛ࢖ͬͯ 3BDLDPNQBUJCMFͳ 8FCαʔόʔΛ࡞Δͷ͸ ָ

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⚡Ұ෦͸Ծ࣮૷ͷ··ͩ͠ɺ ·ͩ·ͩߟ͑Δ΂͖͜ͱ͸ͨ͘͞Μ͋Δ ೖྗʁฒྻԽʁύϑΥʔϚϯεʁFUD ⚡΋ͬͱ3BDLͷ͜ͱΛ஌Γ͍ͨʂ ⚡օ͞Μ͔Βͷٕज़తࢦఠΛ͓଴͍ͪͯ͠·͢ IUUQTHJUIVCDPNTIJPJNNTJNQMF@SBDL@DPNQBUJCMF@TFSWFS ͱ͸͍͑

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3BDL͸ָɹ

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3BDL͸ָ͍͠ʂ

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͓ΘΓʹ⚡⚡⚡

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ࣗݾ঺հ࠶ͼ

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Ұ೥൒લʹԿ͕͔͋ͬͨ օ͞Μ͍֮͑ͯ·͔͢ʜʁ

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೥݄೔ େߐށ3VCZձٞ ը૾ɿIUUQTSFHJPOBMSVCZLBJHJPSHPFEP

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લճͷେߐށ3VCZձٞͷ௚લʹॳࢀՃ "TBLVTBSCͷFTBʹΑΔͱ ͦͯͦ͠ͷ৔Ͱେߐށ3VCZձٞʹ ਃ͠ࠐΈΛͨ͠هԱ͕ʜ ୈճ ը૾ɿIUUQTBTBLVTBSCFTBJPQPTUT

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લճͷେߐށ3VCZձٞ ը૾ɿIUUQTSFHJPOBMSVCZLBJHJPSHPFEP

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લճͷେߐށ3VCZձٞ ָ͔ͬͨ͘͢͝͠ ը૾ɿIUUQTSFHJPOBMSVCZLBJHJPSHPFEP

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લճͷେߐށ3VCZձٞ جௐߨԋ +POBO͞Μʮ)PXUPCFσΧʯ ը૾ɿIUUQTSFHJPOBMSVCZLBJHJPSHPFEP

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લճͷେߐށ3VCZձٞ جௐߨԋ +POBO͞Μʮ)PXUPCFσΧʯ Have your heroes ը૾ɿIUUQTSFHJPOBMSVCZLBJHJPSHPFEP

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Ұ೥൒લͷࣗ෼ʹͱͬͯ "TBLVTBSCͷਓʑ͸ ʮώʔϩʔʯ

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Ұ೥൒ܦͬͨࠓ͸ ʮಉ͡ίϛϡχςΟͷਓʑʯ Ͱ΋͋Δ

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3VCZ ͳͲͳͲ ͷ͓࿩Λͨ͠Γ✨ ίʔυΛॻ͍ͨΓ+ ͓͍͍͠΋ͷΛ௖͍ͨΓ Θͨ͠ʹͱͬͯͷ"TBLVTBSC͸ɺ 3VCZJTU͕ू·ͬͯ ͍ͭ΋Θ͍Θ͍͍ͯ͠Δ৔ॴ

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"TBLVTBSC͸ָ͍͠ʂ

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4QFDJBM5IBOLT ܟশུ ✨ JOTQJSFEGSPN !FTUIFS !UFOEFSMPWFUIF3BDLUFBN !JHBJHB!VE[VSB !UBLBIBTIJN!PLVSBNBTBGVNJ !UIFKPOBOTIPX"TBLVTBSC'VLVPLBSC ͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠⚡⚡⚡